All posts by Chris.SE
Below are all of Chris.SE's postings, with the most recent are at the bottom of the page.
Steve Beresford:
Yes log periodics have a low wind loading so with some of the winds we've seen lately that's good news. I haven't done a survey recently of how many manufacturers are now making Group K versions, if yours wasn't a Group K and you have a problem in the future from mobile interference then you can get free filters from restoretv.uk (check their website).
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Mark Scurr:
You should normally expect good reception from Sandy Heath in your postcode.
There are currently no faults listed and the transmitter isn't listed for Planned Engineering.
There is however some quite strong weather related "Tropospheric Ducting" affecting parts of the country, especially the east which could be causing disruption to signals for some. The BBC have issued some warnings.
This is as a result of interfering signals from distant transmitters in Europe or the UK being received. Do NOT retune if you have badly pixellated pictures or no signal, this will likely just clear your correct tuning.
There is nothing you can do about this except wait for conditions to change, they don't usually last for very long.
IF you have retuned, then you may have become tuned to incorrect transmitters whose signals disappear as conditions change, or your tuning has been cleared and you'll have to retune again, maybe several times as you won't know when your signals are back to normal.
Other than the above, maybe just check all the connections behind your TV and also check that your aerial is still intact and pointing in the correct direction and the downlead isn't flapping in the wind.
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PETER FEWSTER:
There's no faults reported that I can find and it's not currently listed for Planned Engineering.
However there was some quite strong weather related "Tropospheric Ducting" affecting parts of the country, especially the east which was causing disruption to signals for some. The BBC have issued some warnings.
This is as a result of interfering signals from distant transmitters in Europe or the UK being received.
There is nothing you can do about this except wait for conditions to change.
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Sybil Cooper:
See my reply to Mark Scurr in the post before yours. Tropospheric Ducting could still be causing "continental interference" for some, but also do the other checks.
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John:
On the Crystal Palace page the list at the top of the page is up-to-date. Unfortunately the site owner has not has time to amend the "change over time" list. The Local mux moved from C29 to C35 as the last part of the 700MHz Clearance programme in London.
According to Freeview you are predicted to have no problem receiving the Local mux on C35 in your postcode. It should be as good as the others. (Note both temporary muxes COMs 7&8 are now closed).
Try a manual tune on C35. As it's a Communal system you could check with your neighbours of they are getting UHF C35 with London Live on EPG LCN8. If they are, there could be a problem with the feed to your wall-plate. Whichever, you'll need to contact the management for the communal system to get them to fix it. If it's a channelised system they may not have set up C35!
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Rick:
The economic climate hasn't exactly been "ideal" for commercial multiplex operators and broadcasters to consider conversion of a multiplex to DVB-T2. Covid-19 resulted in the earlier than expected closure of COM8 in June 2020 rather than at the end of the licence for both temporary multiplexes -June 2022 which is when COM7 closed.
Speculation continues as to whether anything may happen in the near future, but there are no published plans at this time.
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Mike Turner:
See my post to ron langdon further up the page Waltham (Leicestershire, England) Full Freeview transmitter | free and easy but note the temporary multiplex COM7 on C55 has now closed.
In your case, your aerial should be pointing at compass bearing 120 degrees (30 degrees S of due E) with rods horizontal. Do check it looks intact, is still pointing correctly and the downlead isn't flapping in the wind.
There are no reported faults at Waltham that I can find, and it's not listed for Planned Engineering.
You are predicted to have excellent reception of all 6 main multiplexes and the Local multiplex as you and you are only 15km from Waltham. You are also predicted to get good reception from Belmont even though it's 75 km away, but it is at compass bearing 45 degrees (NE) way off beam from where your aerial should be pointing.
How old is the aerial installation?
Have you changed anything in your installation?
Do you have an amp/splitter, if so does it have variable gain? If so try turning it down, you may have too much signal! You need 100% Quality (or minimum Bit Errors/BER) but you don't need 100% signal.
EPG channels 236 & 237 are on different multiplexes - ArqB/COM6 and SDN/COM4
See Channel listings for Industry Professionals | Freeview for which channels are carried on which multiplex.
Make sure that you don't have any HDMI leads close to your aerial or flyleads. HDMI Has been know to cause interference, and check all your connections behind your TV.
Try another retune by first unplugging the aerial and doing a full automatic retune which will hopefully clear the existing tuning as no channels should be found. Plug the aerial back in and do a manual tune for each of Waltham's UHF channels.
Post back with more information if you are still having problems.
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Me Here:
Hurrah. I hope Sally Lyon has had similar success.
The trouble with trying to diagnose this sort of problem remotely, is making sure one gets sufficient information otherwise one could easily go on a wild goose chase.
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Ron eason:
This sounds as though it could be some sort of interference, but it's slightly odd as you aren't experiencing (that you've mentioned) a similar problem with BBC and ITV/C4/C5 tv channels on adjacent UHF channels.
There are no currently reported problems that I can find for Hannington and it's not listed for Planned Engineering.
As you haven't given a full postcode, I can't check if there are any particular problems that affect your area.
The signal strengths you mention should be fine. What is important is the quality figures which should be 100% or Bit Error figures (BER) should be low.
The TV channels you've mentioned are carried on the SDN/COM4 & ArqB/COM6 multiplexes.
See Channel listings for Industry Professionals | Freeview for which TV channels are carried on which multiplex.
You should be seeing similar problems with other channels on the SDN & ArqB multiplexes - if you aren't, it could be an issue with your Humax.
As you've had a new aerial, was the downlead fully replaced with high quality double screened coax eg. CT100 or similar?
Do you know the make/model/type of aerial - also how is it different from your old one?
Do you have any distribution amp/splitter to provide signal to more than one outlet/tv?
Check all the connections between your equipment and aerial. A bad connection can affect individual multiplexes rather than all of them due to what's called standing waves (as can eg. water in a coax if it's old).
Make sure any HDMI leads are well away from aerial and flyleads. HDMI has been know to cause interference in some cases.
If the problem continues, post back with more detail, postcode etc.
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Saturday 12 November 2022 2:02PM
MeHere:
Nice to hear, that's good, as you say hope it solves the issue. Try and put one of the filters at the input to the distribution amp/splitter. Want to avoid amplifying any interfering signal.
What did they say about not sending out postcards to your postcode/area?